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Chd|====================================================================
Chd|  SPMD_GATH_COLLECTIVE          source/mpi/generic/spmd_gath_collective.F
Chd|-- called by -----------
Chd|-- calls ---------------
Chd|====================================================================
      SUBROUTINE SPMD_GATH_COLLECTIVE(SRBUF,LEN,LRECV)
C Description: 
C Collective communication version of SPMD_IGATH 
C expected to be less efficient than SPMD_IGATH 
C But useful to debug MPI problems: less pending communication 
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------------------------
C   M e s s a g e   P a s s i n g
C-----------------------------------------------
#ifdef MPI
#include "mpif.h"
#endif
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
#include      "com01_c.inc"
#include      "task_c.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER SRBUF(*), LEN, LRECV
C-----------------------------------------------
C   L o c a l  V a r i a b l e s
C-----------------------------------------------
#ifdef MPI
      INTEGER MSGOFF,MSGOFF2,MSGTYP,INFO,I,K,ATID,ATAG,ALEN,RLEN,S1
      INTEGER STATUS(MPI_STATUS_SIZE),IERROR
      INTEGER SIZES(NSPMD),POINTERS(NSPMD)
      INTEGER,ALLOCATABLE,DIMENSION(:) :: SRBUF2
      DATA MSGOFF/7013/
      DATA MSGOFF2/7068/
C-----------------------------------------------
C   S o u r c e  L i n e s
C-----------------------------------------------

      S1 = 1

      ! Send Local sizes to Zero
      CALL MPI_GATHER(LEN,S1,MPI_INTEGER,SIZES,S1,MPI_INTEGER,0,MPI_COMM_WORLD,ierror)


      IF(ISPMD == 0) THEN
        LRECV = 0 
        DO I=1,NSPMD
          LRECV = LRECV + SIZES(I)
        ENDDO
        ! Pointers starts at 0
        POINTERS(1) = 0
        DO I=2,NSPMD
          POINTERS(I) = POINTERS(I-1)+SIZES(I-1)
        ENDDO 
        ALLOCATE(SRBUF2(LRECV))
      ELSE
        ALLOCATE(SRBUF2(1))
      ENDIF

      CALL MPI_GATHERV(SRBUF,LEN,MPI_INTEGER,SRBUF2,SIZES,POINTERS,MPI_INTEGER,0,MPI_COMM_WORLD,ierror)


      CALL MPI_BARRIER(MPI_COMM_WORLD,ierror)

      IF(ISPMD == 0) THEN
        DO I=1,LRECV
          SRBUF(I) = SRBUF2(I)  
        ENDDO 
      ENDIF
      DEALLOCATE(SRBUF2)

C
#endif
      RETURN
      END
